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<a href="asio__waitable__native__hndl_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Core</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="native__handle_8hpp.html">ipc/util/native_handle.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;boost/asio.hpp&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1util_1_1sync__io.html">ipc::util::sync_io</a></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>{</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"></span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">/**</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * Useful if using the `sync_io` pattern within a user event loop built on boost.asio (optionally with flow.async</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> * help), an object of this class wraps a non-null Native_handle and allows one to use `.async_wait()` to perform</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> * event waiting on behalf of any `sync_io`-implementing ipc::transport or ipc::session object.  If boost.asio</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> * integration is not the goal, it can at least act as a mere container of a Native_handle.  `sync_io` pattern</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * uses Asio_waitable_native_handle in either capacity.  If you&#39;re familiar with boost.asio POSIX `descriptor`,</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> * then you&#39;re familiar with this class.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> *</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * @see sync_io::Event_wait_func doc header; and specifically section &quot;Integrating with boost.asio.&quot;</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> *      It provides context and rationale for this guy when used for `.async_wait()`.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> *</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * It may also be useful in its own right independently.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> *</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> * In any case use is quite straightforward:</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> *   -# Construct from a non-null, opened w/r/t kernel Native_handle --</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> *      and an executor/execution context (typically a `Task_engine` or possibly boost.asio `strand`).</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *      (If boost.asio integration is not the goal, then any blank/otherwise-unused `Task_engine` is fine.)</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> *      -# (Optional) If the wrapped handle is unknown at construction time, use the 1-arg ctor form;</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> *         then `.assign()` it when it is known.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> *   -# Invoke `.async_wait()` (from Asio_waitable_native_handle::Base a/k/a `boost::asio::posix::descriptor`) as</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> *      many times as desired.</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> *      - And/or invoke accessor `.native_handle()` to re-obtain the wrapped handle as desired.</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> *   -# Destroy when no more `.async_wait()`ing or `.native_handle()` access is necessary.</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> *      -# `.release()` may be used to essentially nullify a `*this`.  This may be desirable for cleanliness</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> *         in some situations.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> *</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * You may not use `*this` object directly to perform actual I/O; it lacks such methods as `async_read_some()`.</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * Moreover it is likely against the (informal) aim of Asio_waitable_native_handle to perform actual I/O</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> * by obtaining the handle via `.native_handle()` and then doing reads/writes on that handle.</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> *</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * Construction is likely performed by internal Flow-IPC code only in practice, though you are free to use</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> * it for your own purposes.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> *</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> * @warning This object, like Asio_waitable_native_handle::Base, isn&#39;t *just* a Native_handle wrapper:</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> *          It also has to be associated with an execution context, usually `Task_engine` (`boost::asio::io_context`)</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> *          or boost.asio strand.  If you associate, via ctor or assign(), 2 `*this`es each wrapping</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> *          the same-valued Native_handle (storing the same raw handle) with the same `Task_engine`,</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *          behavior is undefined formally; though internally it&#39;ll cause a duplicate-descriptor error/exception</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> *          (in Linux from `errno == EEXIST` from an internal `epoll_ctl()`).  Even if you don&#39;t plan to</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> *          `async_wait()`, this will unfortunately still happen; and for `async_wait()` purposes it will</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> *          and *should* happen.  So just take care not to create duplicate-handle `*this`es associated with</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> *          the same `Task_engine`.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * @note Move assignment works which can be useful to associate a `*this` with a different execution context</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> *       (event loop, `Task_engine`, etc.).</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> *</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * ### Rationale for `protected` rather than `public` inheritance ###</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> * `public` inheritance would have been fine, more or less, but it seemed prudent to close off access to mutators</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * from Asio_waitable_native_handle::Base like `close()` and `non_blocking()` which could sow sheer chaos;</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> * the point here is to watch for events on this guy, not (e.g.) blow up some internal transport within</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * transport::Native_socket_stream et al.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> */</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">   80</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">Asio_waitable_native_handle</a> : <span class="keyword">protected</span> boost::asio::posix::descriptor</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>{</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"></span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">  /// Short-hand for our base type; can be used for, e.g., `Base::wait_write` and `Base::wait_read`.</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a4cbb287f5971162e747f475052abc413">   86</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a4cbb287f5971162e747f475052abc413">Base</a> = boost::asio::posix::descriptor;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span> </div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"></span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">   * Construct boost.asio descriptor object such that one can `async_wait()` events on the given non-`.null()`</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">   * Native_handle.  The handle must be a valid (not closed) handle (descriptor, FD).</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">   *</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">   * Consider also the 1-arg ctor variant which stores no handle; followed by assign().</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment">   *</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment">   * @param ex</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">   * @param hndl</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   *        The handle that might be watched subsequently.  `.null()` leads to undefined behavior;</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   *        assertion may trip.  If the associated `Task_engine` is already associated with another</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   *        Asio_waitable_native_handle (or other I/O object) that stores the same Native_handle::m_native_handle,</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   *        it is formally undefined behavior (in reality a boost.asio exception is thrown; but just don&#39;t do it).</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   */</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle</a>(<span class="keyword">const</span> Base::executor_type&amp; ex, <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> hndl);</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"></span> </div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   * Construct boost.asio descriptor object that stores no handle.  You may call assign() to change this.</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   *</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   * @param ex</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   */</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle</a>(<span class="keyword">const</span> Base::executor_type&amp; ex);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment"></span> </div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment">   * Construct boost.asio descriptor object such that one can `async_wait()` events on the given non-`.null()`</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">   * Native_handle.  The handle must be a valid (not closed) handle (descriptor, FD).</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment">   *</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">   * Consider also the 1-arg ctor variant which stores no handle; followed by assign().</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   *</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * @tparam Execution_context</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   *         See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   * @param context</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">   * @param hndl</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">   *        The handle that might be watched subsequently.  `.null()` leads to undefined behavior;</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   *        assertion may trip.  If the associated `Task_engine` is already associated with another</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   *        Asio_waitable_native_handle that stores the same Native_handle::m_native_handle, it is formally</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   *        undefined behavior (in reality a boost.asio exception is thrown; but just don&#39;t do it).</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   * @param ignored</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   *        Disregard.</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   */</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Execution_context&gt;</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle</a>(Execution_context&amp; context, <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> hndl,</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>                                        <span class="keyword">typename</span> std::enable_if_t&lt;std::is_convertible_v</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>                                                                    &lt;Execution_context&amp;,</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>                                                                     boost::asio::execution_context&amp;&gt;&gt;*</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>                                          ignored = <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment"></span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">   * Construct boost.asio descriptor object that stores no handle.  You may call assign() to change this.</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">   *</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * @tparam Execution_context</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   *         See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * @param context</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * @param ignored</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   *        Disregard.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   */</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Execution_context&gt;</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle</a>(Execution_context&amp; context,</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>                                       <span class="keyword">typename</span> std::enable_if_t&lt;std::is_convertible_v</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>                                                                   &lt;Execution_context&amp;,</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>                                                                    boost::asio::execution_context&amp;&gt;&gt;*</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>                                          ignored = <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment"></span> </div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * Move-construct.</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   *</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   * @param src</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` ctor.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   */</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#aa19dd114ab82118dc1f100d07583b106">  162</a></span>  <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#aa19dd114ab82118dc1f100d07583b106">Asio_waitable_native_handle</a>(<a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">Asio_waitable_native_handle</a>&amp;&amp; src);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment"></span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   * Destructor that does *not* OS-close (`&quot;::close()&quot;`) the stored native handle (if any) but rather</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   * performs `this-&gt;release()` (eating any potential error in doing so).</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   */</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>  <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a3e987cbc14f210607f39d06495c275b0">~Asio_waitable_native_handle</a>();</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment"></span> </div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   * Move-assign.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   *</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   * @param src</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   *        See boost.asio docs for similar `posix::basic_descriptor` method.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * @return See boost.asio docs for similar `posix::basic_descriptor` method.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   */</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#ae38328d6ef63942c3539f7b17b0108da">  179</a></span>  <a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">Asio_waitable_native_handle</a>&amp; <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#ae38328d6ef63942c3539f7b17b0108da">operator=</a>(<a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">Asio_waitable_native_handle</a>&amp;&amp; src);</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment"></span> </div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   * Returns the same Native_handle as passed to original handle-loading ctor or assign(), whichever happened last;</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">   * or `.null()` Native_handle, if neither has been invoked, or release() was invoked more recently than either.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">   *</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   */</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>  <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#ad6663616504b4543a6227eb21279ce39">native_handle</a>();</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment"></span> </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">   * Loads value to be returned by native_handle().  As with the 2+-arg ctor(s) the handle must be valid</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">   * (not closed).  See also `.release()` and dtor.</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">   *</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   * If a handle is already loaded (`Base::is_open() == true`), this method automatically release()s it first.</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   *</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * @param hndl</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   *        The handle that might be watched subsequently.  `.null()` leads to undefined behavior;</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   *        assertion may trip.  If the associated `Task_engine` is already associated with another</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   *        Asio_waitable_native_handle that stores the same Native_handle::m_native_handle, it is formally</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   *        undefined behavior (in reality a boost.asio exception is thrown; but just don&#39;t do it).</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   */</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a7d28277f9ef090032b0483c65f79f23c">assign</a>(<a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> hndl);</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment"></span> </div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">  /// Importantly, inherit and publicly expose `posix::basic_descriptor::async_wait()`.  See its boost.asio docs.</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment"></span>  <span class="keyword">using </span>Base::async_wait;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment"></span> </div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">  /// Inherit and publicly expose `posix::basic_descriptor::release()`.  See its boost.asio docs.</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment"></span>  <span class="keyword">using </span>Base::release;</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment"></span> </div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">  /// Inherit and publicly expose `posix::basic_descriptor::is_open()`.  See its boost.asio docs.</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment"></span>  <span class="keyword">using </span>Base::is_open;</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span>}; <span class="comment">// class Asio_waitable_native_handle</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span> </div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span> </div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Execution_context&gt;</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a472c5765986639fce07e478e660edb25">  216</a></span><a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle::Asio_waitable_native_handle</a></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>  (Execution_context&amp; context, <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> hndl,</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>   <span class="keyword">typename</span> std::enable_if_t&lt;std::is_convertible_v&lt;Execution_context&amp;,</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>                                                   boost::asio::execution_context&amp;&gt;&gt;*) :</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>  <a class="code hl_typedef" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a4cbb287f5971162e747f475052abc413">Base</a>(context, hndl.m_native_handle)</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span>{</div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>  <span class="comment">// See comment in similar ctor in .cpp.</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span>  assert(!hndl.<a class="code hl_function" href="structipc_1_1util_1_1Native__handle.html#a11bd62ce0a7bef4bdfe666201c26d4dc">null</a>());</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span>}</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span> </div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Execution_context&gt;</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"><a class="line" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#aa7310dda2ba43a9e33eff154a8697d0c">  227</a></span><a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">Asio_waitable_native_handle::Asio_waitable_native_handle</a></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>  (Execution_context&amp; context,</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span>   <span class="keyword">typename</span> std::enable_if_t&lt;std::is_convertible_v&lt;Execution_context&amp;,</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>                                                   boost::asio::execution_context&amp;&gt;&gt;*) :</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>  <a class="code hl_typedef" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a4cbb287f5971162e747f475052abc413">Base</a>(context)</div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>{</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>  <span class="comment">// Yeah.</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>}</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span> </div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span>} <span class="comment">// namespace ipc::util::sync_io</span></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">ipc::util::sync_io::Asio_waitable_native_handle</a></div><div class="ttdoc">Useful if using the sync_io pattern within a user event loop built on boost.asio (optionally with flo...</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8hpp_source.html#l00080">asio_waitable_native_hndl.hpp:81</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_a3e987cbc14f210607f39d06495c275b0"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a3e987cbc14f210607f39d06495c275b0">ipc::util::sync_io::Asio_waitable_native_handle::~Asio_waitable_native_handle</a></div><div class="ttdeci">~Asio_waitable_native_handle()</div><div class="ttdoc">Destructor that does not OS-close (&quot;::close()&quot;) the stored native handle (if any) but rather performs...</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8cpp_source.html#l00046">asio_waitable_native_hndl.cpp:46</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_a43d1c463dc07cacfaacdb2b53c020d0d"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a43d1c463dc07cacfaacdb2b53c020d0d">ipc::util::sync_io::Asio_waitable_native_handle::Asio_waitable_native_handle</a></div><div class="ttdeci">Asio_waitable_native_handle(const Base::executor_type &amp;ex, Native_handle hndl)</div><div class="ttdoc">Construct boost.asio descriptor object such that one can async_wait() events on the given non-....</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8cpp_source.html#l00027">asio_waitable_native_hndl.cpp:27</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_a4cbb287f5971162e747f475052abc413"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a4cbb287f5971162e747f475052abc413">ipc::util::sync_io::Asio_waitable_native_handle::Base</a></div><div class="ttdeci">boost::asio::posix::descriptor Base</div><div class="ttdoc">Short-hand for our base type; can be used for, e.g., Base::wait_write and Base::wait_read.</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8hpp_source.html#l00086">asio_waitable_native_hndl.hpp:86</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_a7d28277f9ef090032b0483c65f79f23c"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a7d28277f9ef090032b0483c65f79f23c">ipc::util::sync_io::Asio_waitable_native_handle::assign</a></div><div class="ttdeci">void assign(Native_handle hndl)</div><div class="ttdoc">Loads value to be returned by native_handle().</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8cpp_source.html#l00065">asio_waitable_native_hndl.cpp:65</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_aa19dd114ab82118dc1f100d07583b106"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#aa19dd114ab82118dc1f100d07583b106">ipc::util::sync_io::Asio_waitable_native_handle::Asio_waitable_native_handle</a></div><div class="ttdeci">Asio_waitable_native_handle(Asio_waitable_native_handle &amp;&amp;src)</div><div class="ttdoc">Move-construct.</div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_ad6663616504b4543a6227eb21279ce39"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#ad6663616504b4543a6227eb21279ce39">ipc::util::sync_io::Asio_waitable_native_handle::native_handle</a></div><div class="ttdeci">Native_handle native_handle()</div><div class="ttdoc">Returns the same Native_handle as passed to original handle-loading ctor or assign(),...</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8cpp_source.html#l00060">asio_waitable_native_hndl.cpp:60</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_ae38328d6ef63942c3539f7b17b0108da"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#ae38328d6ef63942c3539f7b17b0108da">ipc::util::sync_io::Asio_waitable_native_handle::operator=</a></div><div class="ttdeci">Asio_waitable_native_handle &amp; operator=(Asio_waitable_native_handle &amp;&amp;src)</div><div class="ttdoc">Move-assign.</div></div>
<div class="ttc" id="anamespaceipc_1_1util_1_1sync__io_html"><div class="ttname"><a href="namespaceipc_1_1util_1_1sync__io.html">ipc::util::sync_io</a></div><div class="ttdoc">Contains common code, as well as important explanatory documentation in the following text,...</div><div class="ttdef"><b>Definition:</b> <a href="detail_2util__fwd_8hpp_source.html#l00208">util_fwd.hpp:209</a></div></div>
<div class="ttc" id="anative__handle_8hpp_html"><div class="ttname"><a href="native__handle_8hpp.html">native_handle.hpp</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html">ipc::util::Native_handle</a></div><div class="ttdoc">A monolayer-thin wrapper around a native handle, a/k/a descriptor a/k/a FD.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8hpp_source.html#l00062">native_handle.hpp:63</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html_a11bd62ce0a7bef4bdfe666201c26d4dc"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html#a11bd62ce0a7bef4bdfe666201c26d4dc">ipc::util::Native_handle::null</a></div><div class="ttdeci">bool null() const</div><div class="ttdoc">Returns true if and only if m_native_handle equals S_NULL_HANDLE.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8cpp_source.html#l00061">native_handle.cpp:61</a></div></div>
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